Flat iron



FIG. 1 is an isometric view showing the design;

FIG. 2 is a back perspective view showing the design;

FIG. 3 is a left side view showing the design;

FIG. 4 is a right side view showing the design;

FIG. 5 is a top view showing the design;

FIG. 6 is a bottom view showing the design;

FIG. 7 is a front view showing the design;

FIG. 8 is a back view showing the design; and,

FIG. 9 is an alternate isometric view showing the design.

The broken lines illustrate portions of the flat iron and form no part of the claimed design. 

CLAIM I claim the ornamental design for a flat iron, as shown and described. 